简单的读写文件

buffer为String类型的缓冲区

fileName是文件名字

//写文件
    void writeToFile(String fileName){
        try {
            File writeName = new File(fileName);
            writeName.createNewFile();
            try (FileWriter writer = new FileWriter(writeName);
                 BufferedWriter out = new BufferedWriter(writer)
            ) {
                out.write(buffer);
                out.flush();
            }
        } catch (IOException e) {
            System.out.println("错误");
        }
    }
    //读文件
    void readFromFile(String fileName){
        StringBuilder str=new StringBuilder();
        try(FileReader reader=new FileReader(fileName);
            BufferedReader br=new BufferedReader(reader)){
            String line;
            while((line=br.readLine())!=null){
                str.append(line).append("\n");
            }
            buffer=str.toString();
        }catch (IOException e){
            System.out.println("错误");
        }
    }

Java简单的读写文件

原文：https://www.cnblogs.com/Yunrui-blogs/p/12845183.html